/**
 * Mixin to handle error.
 * @mixin ApExceptionMixin
 */

'use strict'

import React, {PropTypes as types} from 'react'
import Promise from 'apemanpromise'
import defaults from 'defaults'

/** @lends ApExceptionMixin */
let ApExceptionMixin = {

  // --------------------
  // Custom
  // --------------------
  $apErrorMixed: true,

  handleException (err) {
    const s = this

    return Promise.resolve(err)
      .then((err) => s.willHandleException(err))
      .then((err) => s.doHandleException(err))
      .then((err) => s.didHandleException(err))
  },

  // --------------------
  // Specs
  // --------------------

  componentWillMount () {
    const s = this
    let noop = (value) => value

    defaults(s, {
      willHandleException: noop,
      didHandleException: noop
    })
  },

  componentDidMount () {
    const s = this
    if (!s.doHandleException) {
      console.warn('[ApExceptionMixin] .doHandleException() is required.')
      return
    }
    window.addEventListener('error', s.handleException)
  },

  componentWillUnmount () {
    const s = this
    window.removeEventListener('error', s.handleException)
  }
}

export default Object.freeze(ApExceptionMixin)